Breast-roll retraction mechanism for paper machine fourdriniers



July 7. 1964 L. TRUXA BREAST-ROLL. RETRACTION MECHANISM FOR PAPER MACHINE FOURDRINIERS 4 Sheets-Sheet 1 Filed Jan. 26, 1962 INVENTOR. LESUE TRuXA AT OPNEY July 7, 1964 L. TRUXA 3,140,223

BREAST-ROLL RETRACTION MECHANISM FOR PAPER MACHINE FOURDRINIERS Filed Jan. 26, 1962 4 Sheets-Sheet 2 INVENTOR. E6 1 E; TE u A ATTOP/VKK July 7. 1964 L.-TRUXA BREAST-ROLL RETRACTION MECHANISM FOR PAPER MACHINE FOURDRINIERS 4 Sheets-Sheet 3 Filed Jan. 26, 1962 UNES I 3 8 m. in

o. |||l|||| n INVENTOR;

L :15 l r: r12 u x A BY y A TTO/P/VEK Y w .wnyl

July 7, 1964 L. TRUXA BREAST-ROLL RETRACTION MECHANISM FOR PAPER Filed Jan. 26, 1962 MACHINE FOURDRINIERS LESLIE TE 4 Sheets-Sheet 4 INVENTOR. UXA

ATTOPNEY United States Patent 3,140,223 BREAST-ROLL RETRACTION MECHANISM FOR PAPER MACHINE FOURDRINIERS Leslie Truxa, Montreal, Quebec, Canada, assignor to Dominion Engineering Works Limited Filed Jan. 26, 1962, Ser. No. 168,999 7 Claims. (Cl. 162-273) This invention relates to paper machine Fourdriniers, and has specific reference to a novel means for effecting breast-roll retraction as a preliminary to a Fourdrinier wire change.

The general object of this invention is to provide a new and improved breast-roll retraction mechanism, in which the mass of the breast-roll is displaced in a horizontal plane only, therefore relieving the mechanism of any weight lifting requirements.

Another object of this invention is to provide a breastroll retraction arrangement in which the movement of the breast-roll is such that wire-draping conditions are greatly improved.

Another object of this invention is to provide a simplified and economical breast-roll retraction mechanism, which will facilitate standardization of product.

Another object of this invention is to provide a breastroll retraction mechanism with improved maintenance convenience.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings in which the preferred form of the invention has been shown by way of illustration only.

A known method of accomplishing breast-roll retraction uses arms for supporting the breast-roll which are pivoted on the ends of the Fourdrinier main beams to swing downwardly. This movement is usually controlled by large hydraulic cylinders.

Another known method uses an arrangement in which the breast-roll is mounted on arms, which by a rack and pinion mechanism, are retracted into the main beams.

Other known methods of obtaining increased slack wire for draping, use external lifting equipment to lift the breast-roll completely away from the Fourdrinier.

A disadvantage in the first known method outlined above is that, the pivoted retraction arms which support the breast-roll swing in a vertical plane, therefore large forces are required to lift the breast-roll.

Another disadvantage is that, when the breast-roll is in the retracted position, insufiicient slack wire is available for draping, which means that additional retracting and stretcher rolls are necessary for efiicient wire chang- Another disadvantage is that a heavy cross-shaft is required between the two swinging arms to transfer synchronized operating torque from one arm to the other, or else a system of hydraulic equalizers is necessary to ensure that the two swinging arms move in unison.

Another disadvantage is that the heavy cross-shaft mentioned above complicates the fitting of breast-roll drainage trays, breast-roll doctors, forming-boards, etc., and also inconveniences servicing this equipment.

A disadvantage with the second known method outlined above is that, the complicated rack and pinion mechanism is very expensive to manufacture, and difiicult to maintain in serviceable condition.

Another disadvantage is that it is necessary to remove equipment, such as certain table rolls and forming-board, etc., before breast-roll retraction can commence.

Disadvantages with the third known method outlined above are that, space is needed to store the breast-roll when it is removed from the Fourdrinier, the operation 3,149,223 Patented July 7, 1964 is extremely time consuming and extra manual labor is required to handle the equipment.

Referring now to the drawings:

FIG. 1 is a plan view of the Fourdrinier section of a paper machine, embodying the present invention.

FIG. 2 is a side view corresponding with FIG. 1.

FIG. 3 is a detail, similar to FIG. 1, of the breast-roll end of a Fourdrinier section, showing the present invention with the breast-roll in normal running position and also in retracted position.

FIG. 4 is a sectional view to an enlarged scale, corresponding with detail 4 in FIG. 2.

FIG. 5 is a partial plan view of the view in FIG. 4, showing the breast-roll in running and also in retracted positions.

Referring to FIGS. 1 to 5. Breast-roll 10 is journaled in bearing housings 11, which are bolted to one end of the intermediate arms 12, by bolts 13. Adjustably positioned between bearing housings 11 and intermediate arms 12 are wedges 14, which provide a limited vertical adjustment to hearing housings 11, by means of adjusting screws 15. Adjusting screws 16 provide limited horizontal movement to bearing housings 11. Both bearing housings 11 and wedges 14 have slots to clear bolts 13 in all adjustment positions. Forming-board 17, is bolted to the ends of intermediate arms 12, remote from breast-roll 1i).

Intermediate arms 12 are pivoted to swing in a horizontal plane by pivot pins 18, positioned at the ends of intermediate arms 12 remote from forming-board 17, and mounted on the ends of swinging arms 19 such that said intermediate arms 12 are caused to swing in a horizontal plane on the ends of said swinging arms 19 at points below the bearing housings 11.

Swinging arms 19 are pivotally mounted by pivot pins 20, to swing in a horizontal plane about pivot brackets 21, which are mounted on the ends of Fourdrinier main beams 22. Pivot pins 20 are keyed to pivot brackets 21 by dowel pins 23.

Flange 24 of driving motor 25 is bolted to one of the swinging arms 19. Shaft 26 of driving motor 25 is keyed to the corresponding pivot pin 20 so that, when driving motor 25 is operated, shaft 26, which is keyed to pivot pin 26, will remain stationary and driving motor 25 will rotate, causing swinging arms 19 to pivot in a horizontal plane about pivot pins 20.

Breast-roll doctor 27 is mounted on intermediate arms 12, in a position close to forming-board 17 Intermediate arms 12 are located on swinging arms 19 in their working position, by stop brackets 28, and locked in this position by bolts 29.

In this invention, breast-roll retraction is obtained by pivoting swinging arms 19 to swing in a horizontal plane about pivot pins 20 and pivot brackets 21, which are mounted on the ends of Fourdrinier main beams 22.

Driving motor 25 is mounted on either one of swinging arms 19, and is connected in such a way that when operated, shaft 26 will remain stationary and motor 25 will rotate, carrying with it the swinging arm 19.

Intermediate arms 12 are pivoted by pivot pins 18 on the ends of swinging arms 19, and maintain their parallel geometric relationship during the operating sequence, due mainly to the rigid fixings of forming-board 17. In this way forming-board 17 contributes to the function of transferring synchronized motion from one swinging arm 19 to the other.

For the complete breast-roll retraction sequence, bolts 29 are released, and support wedges 30 are withdrawn within support stands 31, thereby releasing swinging arms 19. Driving motor 25 is then operated and swinging arms 19 rotate horizontally in unison, carrying with them intermediate arms 12, breast-roll and forming-board 17, which are mounted thereon.

When driving motor is reversed, stop brackets 28 will limit the travel of intermediate arms 12 and ensure that the breast-roll is returned to its correct working position.

Swinging arms 19 will rotate either clockwise or anticlockwise about pivot brackets 21, according to design or operating convenience.

An advantage obtained with this invention is that, the horizontal movement of the retraction arms eliminates the need for any breast-roll lifting mechanism and uses the retraction motor to overcome friction only.

Another advantage lies in the superior retraction geometry which provides a greatly increased length of slackwire and contributes to easy and safe wire changes.

This increased length of slack-wire means that numerous retracting wire-rolls are unnecessary, the total stretch being obtained with a single wire stretch-roll arrangement.

Another advantage is obtained by elimination of the cross-shaft or hydraulic equalizers. In the present invention, synchronization of the swinging arms 19 is effected through the forming-board 17, although this is a preferred execution and other means could be employed to perform this function.

Another advantage is the fact that on small Fourdriniers, the retraction sequence can be carried out by hand operation, thereby eliminating the power drive.

Another advantage is that the retraction motor when used does not contribute to the running stability of the Fourdrinier, and can therefore be removed for servicing while the machine is running.

Another advantage of the present invention is its comparative simplicity, which results in more operating space in an area which is traditionally crowded.

From the foregoing it will be seen that I have provided new and improved means for obtaining all of the objects and advantages of the invention.

I claim:

1. In a paper machine Fourdrinier, including a breastroll and main beams, a breast-roll retraction arrangement including swinging arms supporting said breast-roll, said swinging arms being pivotally mounted to swing in a horizontal plane, means for correlating the relative positions of said swinging arms, and drive means operatively connected to said swinging arms.

2. In a paper machine Fourdrinier, including a breastroll and main beams, a breast-roll retraction arrangement including swinging arms supporting said breastroll, said swinging arms being pivotally mounted on the ends of said main beams to swing in a horizontal plane, means for correlating the relative positions of said swinging arms, and drive means operatively connected to said swinging arms.

3. In a paper machine Fourdrinier, including a breastroll and main beams having ends, a breast-roll retraction arrangement including swinging arms for supporting said breast-roll, said swinging arms being pivotally mounted on said ends of said main beams to swing in a horizontal plane, means for correlating the relative positions of said swinging arms, said means including intermediate arms positioned between the bearing housings of said breast-roll and said swinging arms and pivotally arranged to swing in a horizontal plane on the ends of said swinging arms at points approximately below said bearing housings, and drive means operatively connected to said swinging arms.

4. In a paperv machine Fourdrinier, including a breastroll and main beams having ends, a breast-roll retraction arrangement including swinging arms for supporting said breast-roll, said swinging arms being pivotally mounted on said ends of said main beams to swing in a horizontal plane, means for correlating the relative positions of said swinging arms, said means including intermediate arms positioned between the bearing housings of said breastroll and said swinging arms and pivotally arranged to swing in a horizontal plane on the ends of said swinging arms at points approximately below said bearing housings, and a forming-board rigidly attached to said intermediate arms at a position remote from said breast-roll, and drive means operatively connected to said swinging arms.

5. In a paper machine Fourdrinier, including a breastroll and main beams having ends, a breast-roll retraction arrangement including swinging arms for supporting said breast-roll, said swinging arms being pivotally mounted on said ends of said main beams to swing in a horizontal plane, means for correlating the relative positions of said swinging arms, and drive means operatively connected to said swinging arms, including a drive motor having a shaft and being rigidly attached to one of said swinging arms at the pivot mounting point of said swinging arms to the ends of said main beams, and said shaft of said drive motor arranged to be held stationary when said drive motor is operated.

6. In a paper machine Fourdrinier, including a breastroll and main beams having ends, a breast-roll retraction arrangement including swinging arms for supporting said breast-roll, said swinging arms being pivotally mounted on said ends of said main beams to swing in a horizontal plane, means for correlating the relative positions of said swinging arms, said means including intermediate arms positioned between the bearing housings of said breastroll and said swinging arms and pivotally arranged to swing in a horizontal plane on the ends of said swinging arms at points approximately below said bearing housings, and a forming-board rigidly attached to said intermediate arms at a position remote from said breast-roll, and drive means operatively connected to said swinging arms, including a drive motor having a shaft and being rigidly attached to one of said swinging arms at the pivot mounting point of said swinging arms to the ends of said main beams, and said shaft of said drive motor arranged to be held stationary when said drive motor is operated.

7. In a paper machine Fourdrinier, including a breastroll and main beams, a breast-roll retraction arrangement including swinging arms for supporting said breast-roll, said swinging arms being pivotally mounted on the ends of said main beams to swing in a horizontal plane, means for correlating the relative positions of said swinging arms, said means including intermediate arms positioned between the bearing housings of said breast-roll and said swinging arms and pivotally arranged to swing in a horizontal plane on the ends of said swinging arms at points approximately below said hearing housings, and a forming-board rigidly attached to said intermediate arms at a position remote from said breast-roll, and drive means operatively connected to said swinging arms, including a drive motor rigidly attached to one of said swinging arms at the pivot mounting point of said swinging arms to the ends of said main beams, and said shaft of said drive motor arranged to be held stationary when said drive motor is operated, and stop means arranged to limit the travel of said intermediate arms to position said breast-roll in its correct working position.

References Cited in the file of this patent UNITED STATES PATENTS 517,109 Lind Mar. 27, 1894 1,715,531 Aldrich June 4, 1929 1,931,062 Darby Oct. 17, 1933 

1. IN A PAPER MACHINE FOURDRINIER, INCLUDING A BREASTROLL AND MAIN BEAMS, A BREAST-ROLL RETRACTION ARRANGEMENT INCLUDING SEINGING ARMS SUPPORTING SAID BREAST-ROLL, SAID SWINGING ARMS BEING PIVOTALLY MOUNTED TO SWING IN A HORIZONTAL PLANE, MEANS FOR CORRELATING THE RELATIVE POSITIONS OF SAID SWINGING ARMS, AND DRIVE MEANS OPERATIVELY CONNECTED TO SAID SWINGING ARMS. 